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Difficulty: HardSurgical and Procedural Interventions

A 68-year-old male is transported to the emergency department via ambulance with abrupt onset of excruciating, generalized abdominal pain that began 90 minutes prior to arrival. His past medical history is significant for a mechanical aortic valve replacement performed five years ago, for which he takes daily warfarin. He also has hypertension and diet-controlled type 2 diabetes. Upon arrival, he appears ashen and is diaphoretic. Temperature is 38.2°C (100.8°F), blood pressure is 82/48 mmHg, pulse is 134/min and regular, and respirations are 24/min. Abdominal examination demonstrates board-like rigidity, diffuse severe tenderness with guarding, and rebound tenderness across all four quadrants. A portable upright chest radiograph reveals a distinct crescent of radiolucency beneath the right hemidiaphragm. Point-of-care laboratory testing shows an international normalized ratio (INR) of 3.8 and a serum lactate of 5.2 mmol/L. Intravenous crystalloid resuscitation and broad-spectrum antibiotics are initiated. Which of the following interventions are mandatory immediate steps in this patient's management? (Select all that apply)

  1. Immediate transfer to the operating room for an exploratory laparotomyAnswer
  2. Administration of four-factor prothrombin complex concentrate (4F-PCC) and intravenous vitamin KAnswer
  3. C
    Computed tomography of the abdomen and pelvis with intravenous contrast
  4. D
    Intravenous administration of protamine sulfate
  5. E
    Preoperative transthoracic echocardiogram to assess mechanical valve function
  6. F
    Initiation of an unfractionated heparin infusion as bridging therapy

Answer

The correct interventions are immediate transfer to the operating room for an exploratory laparotomy, and administration of four-factor prothrombin complex concentrate (4F-PCC) and intravenous vitamin K.
The patient presents with septic shock secondary to a perforated hollow viscus, evidenced by board-like abdominal rigidity, hypotension, elevated lactate, and pneumoperitoneum on a plain chest radiograph. This is a surgical emergency where definitive treatment is immediate exploratory laparotomy. However, the patient's concurrent warfarin therapy and elevated INR (3.8) pose an extreme bleeding risk. Mandatory management requires simultaneous rapid reversal of the vitamin K antagonist using four-factor prothrombin complex concentrate (4F-PCC) and intravenous vitamin K, alongside emergent transfer to the operating room for source control.

Step-by-Step Solution

1
Analyze the clinical presentation and vital signs.
The patient has generalized peritonitis, hypotension (BP 82/48), tachycardia, and an elevated lactate.
Identifying hemodynamic instability and an acute surgical abdomen establishes the need for immediate, life-saving interventions over further diagnostic workup.
2
Interpret the portable chest radiograph.
A radiolucent crescent beneath the diaphragm indicates pneumoperitoneum.
Pneumoperitoneum confirms the presence of a perforated hollow viscus, serving as an absolute indication for emergent laparotomy.
3
Evaluate the patient's comorbidities and laboratory values.
The patient is on warfarin for a mechanical aortic valve and has an INR of 3.8.
Performing major surgery on a fully anticoagulated patient will result in fatal hemorrhage; therefore, immediate pharmacological reversal is required concurrent with operating room preparation.
4
Select the appropriate reversal agents and procedural disposition.
4F-PCC and Vitamin K are chosen for rapid warfarin reversal, and the patient is routed directly to the operating room.
4F-PCC replenishes vitamin K-dependent clotting factors within minutes, making it the standard of care for emergent surgical reversal of warfarin. Simultaneously, immediate laparotomy provides definitive source control.

Key Concept

Concurrent management of emergent surgical source control (exploratory laparotomy) and rapid reversal of therapeutic anticoagulation (using 4F-PCC and Vitamin K) in a hemodynamically unstable patient with a perforated viscus.
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Topics

Surgical and Procedural Interventions

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